manifest: Add chromeos-5.4

BUG=chromium:1006306
TEST=repo sync and build chromeos-5.4

Cq-Depend: chrome-internal:2015096
Change-Id: I2aec34393e213ae4add19df795db464f51c958d8
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/manifest/+/1871812
Commit-Queue: Guenter Roeck <groeck@chromium.org>
Tested-by: Guenter Roeck <groeck@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Kirtika Ruchandani <kirtika@chromium.org>

full.xml

@@ -303,6 +303,9 @@ Your sources have been sync'd successfully.
   <project path="src/third_party/kernel/v4.19-lakitu"
            name="chromiumos/third_party/kernel"
            revision="refs/heads/chromeos-4.19-lakitu" />
+  <project path="src/third_party/kernel/v5.4"
+           name="chromiumos/third_party/kernel"
+           revision="refs/heads/chromeos-5.4" />
   <project path="src/third_party/kernel/next"
            name="chromiumos/third_party/kernel-next"
            revision="refs/heads/chromeos-next"